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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        /* 请用循环计算出 1+2+3+4+5+...+100的值 */
        var add = 0;
        for (var i = 1; i <= 100; i ++) {
            add += i;
        }
        console.log("结果为"+add);
        
    </script>
</body>
</html>